Ricoh MP 7503SP Field Service Manual page 1143

• C-MOS image sensor scanning and image processing with a CIS
Controller Board. The controller board (with the exception of the engine functions controlled by the
BICU) controls the system. This includes:
• Power supply monitoring (shutdown, Energy Save Mode)
• Network monitoring
• Printing, scanning control
• Memory control (includes HDD)
• Operation panel control
SBU (Sensor Board Unit). The SBU takes the analog signals of the image scanned with the C-MOS
image sensor and does the A/D (analog-to-digital) conversion.
IOB (I/O Board). The IOB handles the input and output of all motors, solenoids, clutches, and sensors.
RYB (Relay Board). The RYB distributes DC current.
HDD (Hard Disk Drive). The HDD stores image data.
• Capacity: 320 GB.
• Document server capacity: 96,750 MB
• Document server max. capacity: 10,000 pages, SP expansion 45,000 pages (SP182-001).
PSU (Power Supply Unit). The PSU supplies DC power to the entire system.
PSU Fuse Table
Fuse
FU1 2A/250V
FU2 5A/250V
FU3 10A/250V
FU4 10A/250V
FU5 10A/250V
FU7
AC Drive Board
Rating
SC664-01 (SC log 664-21, Soft Error 991-00
The copy and initial settings icons are not displayed on the
Home screen. Machine returns SC670-01 about 4 min. after
power on. (Soft error 899-00 logged.)
SC272-10 (SC log 547-02, Soft Error 515-00)
Detected connection of LCIT but cannot detect paper, or
finisher not recognized. Copy jam
M223/M224: SC547-02. (SC log 202-00, 647-02,
120-00.)
M225: No power code. (SC log 202-00, 531-01, 530-05,
581-00, 120-00)
--- Not used
Electronic Components
Blown Fuse
1141